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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01d75ffa5dc1e1dc9dfe26e0cc7f1fca34e3b8128eb7ace6ce41e0dee344017' 
  AND token = '/LqZQtrCBbSDCGEAAOFOjoSuq5NEMZm4b0uIy8x4t1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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