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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e902aa926fbcfcd4f4cff1d208e35a10aeb30338fffd744c8c93ff1769f572' 
  AND token = 'QeNsjBhFDBwa2MQu4SmMftf+KEKZBZ2Q7gl9sgClkcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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