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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba3a6340f6a949891d2daae15c643dcf74c6652b553b2f1391a85a3c604f3b5' 
  AND token = 'Jtn8Uwj71QaIhsJtxlXY2lsSkdNp4vRxOQ0/XvBAD0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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