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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b15ded872a180828ed7a77ad7dee3e090195bc40c13a41e4a8e79be68f78aa9' 
  AND token = 'mngSCtkhYwVZ1SuxHGOR0fQ1Nn/xXetPnk03ZFLBy5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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