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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b4bf427e39dd99b6278ed259c08b0b8f98fb094a06a1a5d73a007eb9bdc9e2' 
  AND token = 'g9YZJx+QTwmVf5dgS+Xi8Oar5tQpTN14XkxROsfwWZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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