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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949d800ffb54aee043c9c7ce3a7af5e7f9897bf7e10b8a0e46c9f1f6439d070c' 
  AND token = 'H2F0deQInMKGmRd1NRlN2ckyFXt4Ky4cb4clbXKaOeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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