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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6885f0765cb17b5b43c292288ebe01ab0a9b3b8aa07a1348bcc4d4f6de62ef70' 
  AND token = 'r0K9zrJliDHh7haQWUlYHpptuImV2sr2fv+xC1prgl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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