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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa07ead207c2d534c061155bbd04267f3419e84bcc8993c0e5384f66826edc8' 
  AND token = 'TS92EYqKxgCoZOc1lUC5xEjTsnRIO+SuHha37CIgtvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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