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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd269c9483a6b4e70390f9b1a38b5644a433f9412ff2935cc7b1eba54a32fdd' 
  AND token = 'Eym1FMGAEnUgRZEZzzNgfGvVTiEvLM8WUbXci+UNoOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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