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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231fa539b01dcbef6f025101a80b37ad81276ed17899b8bcea21d0267f306a6b' 
  AND token = 'bT2NxGRpPb42WQsmoAVwt6XS1zRlemh/+/QTw09V9go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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