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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b737a3c2782dccd9c3c5390083010833bce9f998d5ca11c260a29d1a361401' 
  AND token = 'UTYitzBe0YqLz7aCeqV2zHxABHf4e0WvjAeOTXwMHPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}