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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59290d674ad5a3f26ec39c1f9fc4d9b5b5e1d70cd6ec1f30cb7ad0e2129ee563' 
  AND token = 'gB8s0G5DqPyKoiKKXIJGagtt7L1E9Rtb6QAN7IFYqQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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