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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8aa46821007f6191978624d873f26d18a3845125ca5113b788ad9e84e5a903' 
  AND token = 'BOK9M8FKwyh5QOdR0CbRw8UR+jlJjJuqMkIGUOGlyio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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