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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c8de732cda8850a7337d99a70af49e81038f1ac0924a6c018b26969b3665c9' 
  AND token = 'phuQs6eo7zL1HxUyndauWep0Jw22C8WoRsU8Fj6M5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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