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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd9d9fa0f4896e42e7aa6f2c2d39db617bbfa64c28c68a8b60a9aa7ce07611a' 
  AND token = 'gWxm9eacl1dUXVWpidxmDhRuHmS8C9BZWwCYGeV0qxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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