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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee4e8ebb3b747bd7fbef424fb7bb1c52d8b9fdb328a989f9a361cfd622713bb' 
  AND token = 'K/JeQlxDb+zsdWUFo8GAIgg+932S6QiW0jFhduVUb0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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