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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b30c0c4b4ecda7aaa7935470b41d86f761b251b303f6d11efa667836fd8693' 
  AND token = 'jqD60Ka2R1zyFu9asp3uCXLOYxeLvVHL5+HlsQnpc2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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