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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f09f1bdc2dd4b1cec86cfa16cca20148b83fa468c479b364be2bfa7819099cf' 
  AND token = 'Db9AkxIcJTX13af33wq7xm5ulwViYJhXYCZ0TDZB6Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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