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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8465f83be2a3a678ac67d3bdb39cac847064886f2182a31be5739b940745cb85' 
  AND token = 'dpAQVtTxBHiMm5MjyWxofkeE8B0TCywkxcuVY3kJtZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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