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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634c99a6807553a8cc30eb6534a05b380849bb64da88dc4a5e63d6c7213ad986' 
  AND token = '6/6WdWfCx0h5XJo16vtzRxVJvrDDpFYzJByc5QOwuZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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