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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6730bedbc4bb699bcba641602f2d8331b8e6cbabca8b217499076e24c0ecc7' 
  AND token = 'OQgIYTfvuK8s7GH98gDfF1MAUE9AWnWl/BjsKac/uu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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