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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791b126a2d7614aa2cf9093021929f11bb7c4c09791dd02e21bcc78c33dc65d9' 
  AND token = '/JoR9idBETorK91Synq0T+JUuwRl04N6b69a3v3wjtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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