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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8b8d92632d6250a9abd3caec7aa8c860348f52417a4d63f3fa824d134906ba' 
  AND token = '2LMzaCPYZEqiNzvZmkf9ndQZHjwsaTuYl6qMGQ7o3bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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