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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a05a6a05f1fd6fb4f23f8ab9da6d0fcc591a4ac2809cd468b6cbf88d8a2aca' 
  AND token = 'nxh5E3CTWrSg08f1AH5a8nCDS0lrrT+hetB8KyF9C0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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