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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62ccc1bfec35214fce22243c8e5e7d10e751c7af0315754d33b3e6d79177c05' 
  AND token = 'zZ5NzK57uuoQt0X28FoULOa0UdLL/JHY8k/Dzpieepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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