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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494947f165605512958ea2be8555a984ea942054d07213a5305445dc800ad521' 
  AND token = 'kXz4kl+mMvU2m2exTk+FTkhZH1t1ilcHN6yivBW2h70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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