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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd096cdd6df4603abdb3689470808b45af557b457c1cbf8d31e8dcf819bfc1f' 
  AND token = 'u3u8HP5C0shfVKGOP9HUa1QaVZ+yXDSIgILRhFUR4Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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