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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52c024fa949778420389b423b56b594595b189c69122664560adca172d6f078' 
  AND token = 'Y9tnjy+WX21VI9zo7t/XP6mcW4jiY1siI4StVabA9jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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