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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7910d8b5d1a9f8f19281a140b98af9cb36121a6cde0454046d53024e34fbe9' 
  AND token = 'PAA9oqoLEeu7CnA4+9fX9gMMQgUhnUNeZLXaTPVPVZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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