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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42077bc865bfc83331b32b33efd979da1e085d600e1a43706751a9b6c61bd96' 
  AND token = 'z25pllu0FUqEp9TQtMB7I/Org2NJOP+aw5WTxdbhzf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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