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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af1b737d406bec7bb8d66724579102a05d07cea59a51438fe9e579365e89051' 
  AND token = 'ndzNREGnsv0AP6BezDLqGzSrAL0c8Xzab9zpdMIs0JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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