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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e08df4aec9762c9941e9e8a664720400376b79f4d511e2c57c834c2654993b6' 
  AND token = 'Ws7X/uezAqxzhPvn2XTNlaZrPEWufuofem6Q0T/BD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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