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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fab0eb259c39e441d0eae9a648484ad2d6156614c8b92936576fd7f165455ef' 
  AND token = 'GJdtP8wBEJSimLaXtiuYhMi/ckUMqer9PvcLTmcpS88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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