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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66eded73738b8404e01107d3cf29e5fdca039d5c8ca923c8e98eddb8674e9826' 
  AND token = '852akKTMw45L6QYaacO7Yi7gYpaed/1rhFiGjuVcOLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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