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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227b86a6930fd33da95ecc67c8293399f05bcef1851ab1a5749cc16f1335f0d6' 
  AND token = 'mkOkriZ4/Soh49k/WKkEh1q712yJoVawEmfMJPTd6bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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