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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0711203668fe991109cbc1c45184aaf062767aa965ebd7f6725c973158c7362e' 
  AND token = 'e3jREaTY1zyag5nJKRzW1mjIDB7LOauQSWQyXiqXA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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