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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0008f6d9704449b58b3d9b3f14dd2f5890cd3bc568f823ee14f2ed6e7cd83eb3' 
  AND token = 'jFJ7inHcbRaQIfoqQ2kIvhWAgiFOdaT8IcJug+VFcWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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