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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701f6799ae2f99d712d4c922e9d4f52fe96147a368898c2732cc34249db3840a' 
  AND token = 'lugbSQmEN9PIbBVSRB56STJtehd+edd2ZUDGBb3t09E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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