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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989629aec945494a8215d8c9bcfe8d95043c6c86f44c9509d6573643dc7fcc41' 
  AND token = '7ExzowX/OVjcGH/trN0dj/09iwo3mCRpt5J5MpvQ7wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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