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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab6f14482da45f1f92f4e06bd042368f98969c374fb0a485e45d0cdc71a7d52' 
  AND token = 'bN0SZ0+D9wAbIzTUZQzNqIIu2nddXIyWP6wSBRUTUKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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