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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a07e3763454a8024779ff35a2484c50f31b0c4850b34c646a9b41967d684705' 
  AND token = 'XnytM/g0fBCizhIY8ylDQjr3bIxVsodKLITk0k+lx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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