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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb8975727dfb1d50f484dc4fcc40fdf8e06ccedab2f52ea8c36970784e0968d' 
  AND token = '3eOM/1Cbag7WCZAgWy0jsa5RgrVuuGQdpf6Iw1VUkSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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