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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db1cfae4ffc1d555e9f78315b7f4bd4f503e4bb065a79145afb702fe04f78f4' 
  AND token = 'jozgVuafGnBT656sA9sabNvY/Atn6dxvMEZznLEYMuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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