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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c35b8c7e9f3ed8313561453bc7bb210fc58df02e2e2458ff02b4805af40a01' 
  AND token = 'ajhU3oeBD9MicIN3zqC76znWxFg26RT+DzWQ2qK+I9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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