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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf34d366a7b0ce408b3fee6003788b6506cd64d51b52a372b32b01f1ed69a08' 
  AND token = '9T7BYjqcy/jit4Dq7nTtnhSlOzzJEhyYR7VSeIx0ybE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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