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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d92ae4383e0c3af6b33916f00cd7b0613fb7d1805cc995034ec588d2a192de' 
  AND token = 'oIxOwLbhSXbrNUDkloOjFotAw5nHfJBCLN+tkbju+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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