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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31faf667d9701eac50d2d894a9af835f634cc0df0d271bda8afcdb49826da66f' 
  AND token = '7H72N9PpVTpio33mR9sEt1uCRh+6fGEX+7Mw/8Qiji4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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