Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537eb56dda668cfd1f8a017ae576fd25e79e35a1db02ca6ff74312a1b5770f38' 
  AND token = 'j73Y/H6uqnqH+2fn25NEFqBCVQGzxrWbaW0yRRfq4pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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