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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09a119586ea60ad687b7d1cbc39b0acb43726091dee7c6d4a1584d39da891ef' 
  AND token = '1JkmGOY1lb4F6E7hCoOG0hxJ5yA2YccYupuINf7pDQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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