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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17117f2f7ebb725d88f5681764c99712c1f03907b51804b2c71308c0b42f9927' 
  AND token = 'qtrDp/zRl+Da+chT2cj/WGLD7KeR5RVofIWoCopmgKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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