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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afeef4f01522bcbfba5bac533c9019b4eda06fce9f4aa1e0b311dd26748f48e1' 
  AND token = 'CU3Y/ITDUGfGMotgJz1nse7dIly37pu2JVPro+ujJVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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