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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48dac86af46d5e3c8ebd81917adac0136db7178bc4778937a6ddf66a4cc9673' 
  AND token = '6nnSAEQNS4SytJEflWKVfrLZPOrdIUI6itUAwplh7iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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