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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6132f8bca63bf3607fdbc7b99798276eb66f9a7c71c5750787adee8580d9d352' 
  AND token = 'F0AvSwWpDO/QTrIJQ6UUwsEY6eE4q+SfAPpsbifMD1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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