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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c03f70552f4f06f506af3f0acb33dffc3190b28798350e9133d06342deda15' 
  AND token = 'RUOK4RO42lvvpYADjz6/q8R6Fj7a0I/zZzPWZNlTALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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