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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1653aa67417ddb673856692feb905b859b5caad7e09f424ff12fe9cf1853111' 
  AND token = 'AC0tcW5Ey6+3WBE3f9O8qsV2jFOUQ9rWskAVfHQbESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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