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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c583936df5e3fa3edd171a6fdb7be772fb20dd34371471b2f647b275a20bf82' 
  AND token = 'DmRqRpmFRva1WmRr/ePyedDIO/Wc/KHDyKtymng0uUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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