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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d637576ddf9fa4e401fe89bdc862fbf785c6947a1ec584456dc0641d07a13dd' 
  AND token = 'JmJZ200M9plFXnOkMY/VSQfywwZ+futBTV6cfOLYW3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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