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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29484d146e9236033fef58eceebf510efce00da763ae3a07be6cf6009558faab' 
  AND token = 'k+Ka8TRnvcQeYhznYNSj5Bg6beoKgR7sj4yxI5MQ/EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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