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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059f348a129cbbe78a405c5b5054f7640b0e6a3431592cda8bfa9966457e8578' 
  AND token = 'RPdxM6ujqV9/PDUmu8XKsuenHg3xqi3Qf1xnUJJxKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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