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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016436efead5ffccbce14e2177756d33e66991dc5adf3ea7b6bf0fc585eb36ee' 
  AND token = '/MnYtUSv+f80YUcIx/LiAx3HgYqR010m4n7twc33OSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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