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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf69662c1102c53b4870d28324d70e0d88f62094585a01c9ecd5ea9abe3d3a8' 
  AND token = 'x62VnUiYdz6Z7uF9YFbiqaptt4KuRBQ1k4qMU/zsSe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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