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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9dc02842a14e80d6dbecd8b781d37480623db5b90dac16d00229d655c54f158' 
  AND token = 'ZW9MI8a/tsvvta77DpM/1Di/lr0X0FNoYta7IqFoOE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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