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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ee59174c506214976a93afd711a7b335b15df303a5204c52ccd72e95575f41' 
  AND token = 'GoyVgA+uqT0RhieMRruOW/mfImqwcTxA2IbUT9v6gEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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