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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5720183a47f23901b83dc64953656d9dafd60ccc32b0183cd1e23657eec1de' 
  AND token = 'rDl1hUpsPdO0FJXkyCoI8NVlQyt5/t2c/QKyCeNydIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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