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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ddda0a66816b11afcea346b77f0a0b2b06a07e8732ca30d1438b97acf9df07' 
  AND token = 'KLXAxKTA5eAsi6LMuKRvodWr3BnjMns5yh7VtPowaQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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