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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673cf110220ed91d3e9d983175bd99f97982aae91da8d2af3df58ccebc5bf63c' 
  AND token = 'EF5rZ6PWwR4EeJcZ4QabWU2wjewNvM1rvOIwRmYFtcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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