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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459613e6ecd0d65866225174701e36c6f5d73407bdc271b7ba671b9b38c0df1d' 
  AND token = 'TQyYD18uNl5wBhKrQBVklsQ88iOImVlEA4o0tQU6drQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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