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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cd79116935a290c478a3b738cd63ac9903d198cb5a930f98cd81ea00dce8e3' 
  AND token = 'CKDfggQ+LsgXVDa4HmnINsjhMyzfIdcPB/hzWkSSmao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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