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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e209ffabd976c58dc7473dbe55ee6c6f534c54fa7294cfc089a397bb448631' 
  AND token = 'g/q2wEOnv6A4MRM4Rx35xiqABw8AAU5rmhGF9MIpqt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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