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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79c1e6411bd1f0bb27ba01f54bb34f432df38af91490c0de9fdd1d7cab89c8e' 
  AND token = 'gbkFpXL9aURJNg+DV3OUxx+4au/znKLa6STSrT9Y68w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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