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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3aa5165a05605baf0a3dc175f0ad1d3f3302f0bdcff9ceb2e04921e175d97b' 
  AND token = 'iBn6hhxnzOuffAcGaW6/aLyteXsHcu/tHy86hoPNTSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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