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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbae8cb9baa6296f6ef46f675ffbd6df6e4a77000f10800bcded6a4d2d56b2f3' 
  AND token = 'M38w8epyHMWxQiknROuw3t4xupyVgBO1qfv87qVN52c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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