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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41145b739d9114371108a84d32a2ca87c8f8ee672008b7329f4328729d2beb82' 
  AND token = 'qb4kVHsN6qK1KwV2l1xWajispgYdtvUn3hwMwLd5Xpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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