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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afff8aca9072d751be3c637688a3afb4685393b3b23f536cee36008af862f783' 
  AND token = 'gv7OL13/T1qmNg58G+1OwZ1aQlu/EOdfiuMe1TavyfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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