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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7ea17edf79ea6598feeb13d261ed5c610791305ec8bbd7b3e5c469cacec8c0' 
  AND token = 'eQ7cxM2zRmAqEurAmLKuWwsXO8oU3Ens5B56vUT248o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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