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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ad546be45e9ef4adb00a5e449c7f9213ae4ea1efc7b4d0de285b203c2ff9f0' 
  AND token = 'wOM6cDHjdBro0lsUJEJhKRSXDx9nkn7CVspKZdzjgMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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