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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1477a9eaab8c447e959f27be3ee9038dcb6bad18bc75b44ee5ec9e67949b717e' 
  AND token = 'GTSMbF8A0+J3HiRFMqD6b25aNCjH6/RxqNEbX8oL1lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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