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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038b371e6e93d8bb1ec105d4b83ee992111ad0838351ef79e19455e18851393c' 
  AND token = '4KCKAikTVqzsL3NcjfbzK0r0O/6fS9WTn2EACERvbzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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