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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f291e6e95282f8e3be21ecf848e4d74f4cf2ab95aacb235a6c5e9ef4b4cad75f' 
  AND token = 'QfFMtTb7G66YBcEDJ28QLIj0dGL2pDO/6WpBURmTnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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