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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698df1c5bb2ca6d5391c496425699a12de53c977ece9cf9c097e66da4e225258' 
  AND token = 'a9EU3Tq+im4DkQA77HXB52SljgoQ6duSFEV561PIUXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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