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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c7ed334c8f8ea65ddc980c11bb93601fbb4dd48c9d752e37cfd8b9c0803b1c' 
  AND token = 'v8CHULYzfXHSte3leDDfLZrH6jmv/0ZK2enQx0l2NYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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