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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfcc9963b2cab162bd4e3ab7239c53b19ec581f5143230b2a42d096f6a9e57d' 
  AND token = 'nwtr3bbHT/rWvy17rlb1W7KaKooKTTVUsv/5Rf+A+nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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