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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019c65139314b9dfa09e9aaf301c955f4c30d287d084b88541211ca7e698c7d7' 
  AND token = 'xO6dicRZ+7l9Z8xMOtIosQoGI5B6no2PYDQiI4LhtK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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