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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0894448bbe1bd7d62b89223e8962a5ef5a7d1c3fd9175e8df58a2cdf91386ae' 
  AND token = 'VR3KOf5yylA3tvx37UeYoVQqeO4r9SzNVM28KCLN9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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