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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67be439d8da23b11547da0782f444577c71f1e5b25780c4f302169d0f602e80b' 
  AND token = 'YqKk8+GeFOVnRoIN6wyV1Ew+Eh3uaVCfDJECTUEI7Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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