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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797dc6a455261be43149ead1140f7b116555bd1c4e19c2836b4f32ea751d38b9' 
  AND token = '1sboFkIyI3v5lNgMDfbHXg2RaQEcU6F3mDMI6WoSj1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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