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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69555fc7e3cb06d662fb95a543edab11f6ad3b0d5ebb751451919af20865b0c2' 
  AND token = 'CeXGyX4FwuJzY2oL+yJ5oF9a9pP+yd/vQEDcZS15CJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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