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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab9da7cc1ed1d6074844ea0b39b3c35b32b58b973454597fe4f915526ecdc7a' 
  AND token = 'E3PRgJjCb0b6AFa3rGXBI3AIwwR0yQLlPAVg4KPoT3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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