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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9ac12886ffab4df8296d67d06595ce4dcc95d083b7b17f7863f409a9af0fbb' 
  AND token = 'l6RUENxV7S/hHckjGFCGsTbQWxpon4YZd8dPYfTk8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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