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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81fba9decaf8f7ee36e4835614c9acea25149710bb29bc8ab77cda418876153' 
  AND token = 'YTF/WnB/vD1AaxiVSH/0rwMkxdzscKIZlWi7tNuNAMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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