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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160f0098e80fd98c02288b29a4d64a8578d235fc67a0facd5a99ecd1d699d7e9' 
  AND token = 'y3+la6hMwRQ3TtixfZYTebfYygA9rk+aF8qgGwt2PpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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