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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fc68356ab6b1ae48143be4e5394b98ecde76b57fe96d71d7dbff7dcec07bc3' 
  AND token = '+8Yz+k6B2elygAkarGr092QXS2Ycv4YFtHnC1CoeWo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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