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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad9e434c34e522bdef997901cc6265a7f06b1200a2ae96b7a8e3726bae2b552' 
  AND token = 'lzkUXe+0kXSngtmA0Ff+mqj0KVqv2s06ARdWKV4fKPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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