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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ad4795a9b52419c5db4d86e30605eaea24f3e52ed3ef7625f543d8777cdfa1' 
  AND token = 'QR9NWY3MFx85LBwDAuM3K69O7Y5ElsPN0CvX3nChSbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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