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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a35a80be0b9885013a6fae828e651c4752e4347f8664f690fc27ee0f782567a' 
  AND token = '94jROIlpS/ljEyjTDwdraa6XE0xNGApck4Gn2ZZ//QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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